Question

Consider the following four molecules: CO2-3, PF5, CS2, BBr3.

Which of these satisfy the octet rule and which do not? 

Solution: Consider the following four molecules: CO2-3, PF5, CS2, BBr3...

In $CO_3^{2-}$ all the elements have a full octet, all have 8 electrons around each other.

In $CS_2$, C has 2 double bonds which gives it a full octet, S also has 8 electrons around it.

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